Hello, My name is Heidi Wolff and I have been keeping bees for about 12 years. I manage the Bee Lab at the George Washington University and make poorly edited instructional videos on beekeeping. My friend Eddy Honey recommended that I post these pics on this forum to see if anyone has ideas. I am hoping that it is not AFB. Since it is in an observation hive, it is difficult to open it up, and I have not done the 'thread test' yet. I hope to do that when I can take the hive outside, weather permitting. Any ideas?